Cummins/Onan MDKBH — Specs, Engine, Parts & Maintenance

Service parts for the MDKBH

Grouped by system, with how many of each the parts manual calls for.

Fuel system

1 required

149-2106Fuel filter$34.99eBay

Oil system

1 required

185-7444Oil filter$9.09NAPA

Belts

1 required

511-0197Beltsee priceAmazon

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

Ratings spec sheet not in our library yet — see the documents below.

Maintenance & consumables

Item	Spec	Part #
Fuel filter	Fuel Filter	149-2106	Amazon eBay $34.99 NAPA $61.61 KuduParts $68.00
Oil filter	Oil Filter	185-7444	Amazon eBay $29.95 NAPA $9.09 KuduParts $11.00 FridayParts $13.23
Belt	V-Belt	511-0197	Amazon eBay

Service intervals

Item	Action	Hours	Months	Notes
Coolant Level	Check	8 hr		Before first startup of each day.
Engine Oil Level	Check	8 hr		Every Day / 8 Hrs
Exhaust System	Inspect	8 hr		Every startup and every 8 hours of operation; check for leaks and loose hose clamps.
General Inspection	Inspect	8 hr		Includes inspection of oil level, coolant level, fuel system, exhaust system, batteries and battery connections; before first start of day and after every 8 hours
Generator Set	Inspect	8 hr		General Inspection; includes oil level, coolant level, fuel system, exhaust system, batteries and sea water strainer.
Sea Water Strainer	Clean	8 hr		Clean if necessary and make sure sea cock is open.
Battery	Check	100 hr	1 mo	See battery manufacturer's recommendations.
Battery and Battery Connections	Inspect	100 hr	1 mo	See battery manufacturer's recommendations
Fuel Filters	Drain	100 hr	1 mo	Every Month / 100 Hrs
Siphon Break	Check	100 hr	1 mo	Every Month / 100 Hrs
Siphon Break	Inspect	100 hr	1 mo
Water from Fuel Filter	Drain	100 hr	1 mo	Every Month/100 Hrs
Engine Oil and Oil Filter	Change	200 hr	12 mo	First service — Every Year/200 Hrs
Engine Oil/Oil Filter	Change	200 hr	12 mo	First service — Every year/200 hours.
Fuel Filters	Replace	200 hr	12 mo	Every year/200 hours; change if engine lacks power.
Oil/Oil Filter	Change	200 hr		First service — Every Year / 200 Hrs
Brushes/Slip Rings	Check	500 hr		Must be performed by a trained and experienced mechanic.
Raw Water Impeller	Replace	500 hr	12 mo	Every Year/500 Hrs
V-Belt Tension	Check	500 hr	1 mo	Must be performed by a trained and experienced mechanic.
Engine Valve Lash	Adjust	800 hr		Must be performed by a trained and experienced mechanic.
Pump Impeller	Replace	800 hr		Must be performed by a trained and experienced mechanic.
Generator Bearings, Drive Belt, Belt Tensioner & Drive Coupling	Check	2000 hr	60 mo	Every 5 years/2000 hours; must be performed by a trained and experienced mechanic.
Coolant, Pressure Cap & Thermostat	Replace		24 mo	Every 2 years. There is no zinc anode to replace.
Generator Set	Other		1 mo	Exercise at least 1 hour every month if use is infrequent; run at 1/4 to 3/4 load.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

Type	Item	Value	Unit	Condition
Gap	V-belt deflection	0.4	inch (10 mm)	20 pounds (10 kg) applied to middle of pulley span
Injection timing	Fuel Injection Timing	18.25 − 19.75	° BTDC
Injection timing	Fuel Injection Timing	18° – 20°	BTDC
Injection timing	Fuel injection timing	18 - 20	degrees BTDC	timing marks line up at 19 degrees BTDC
Other	Battery Charging Output	Trickle (3 amps)
Other	Battery cable gauge	1	AWG	total cable length 22 ft (6.7 m); approx. diameter 9.43 mm
Other	Battery cable gauge	1/0	AWG	total cable length 30 ft (9.1 m); approx. diameter 9.46 mm
Other	Battery cable gauge	2	AWG	total cable length 18 ft (5.5 m); approx. diameter 7.42 mm
Other	Battery cable gauge	3	AWG	total cable length 14 ft (4.3 m); approx. diameter 6.61 mm
Other	Battery cable gauge	4	AWG	total cable length 10 ft (3 m); approx. diameter 5.88 mm
Other	Combustion Air	18 CFM (30 M3/HR)
Other	Compression Ratio	23.5:1
Other	Compression Ratio	23:1
Other	Coolant Capacity	2.2 quart (2.1 liter)
Other	Coolant Flow	3.0 gpm (16 liter/min)		50 Hz
Other	Coolant Flow	3.5 gpm (13 liter/min)		60 Hz
Other	Engine Oil Capacity	2.2 quart (2.1 liter)
Other	Firing Order (Clockwise Rotation)	1-2
Other	Fuel Injection Order (Firing Order, clockwise rotation)	1-2
Other	Generator Cooling Air	60-80 CFM (100-135 M3/HR)
Other	Maximum Fuel Pump Lift	4 feet (1.2 m) with 3/8 inch ID fuel line
Other	Maximum Raw Water Pump Lift	4 feet (1.2 m) with 5/8 inch ID hose
Other	Minimum CCA Rating	360	amps
Other	Published Standard Repair Time (example: productive 3.48 hr + 5% personal + 10% supplementary)	4.0	hours	example calculation in foreword
Other	Raw Water Flow	4.0 gpm (15 liter/min)		50 Hz
Other	Raw Water Flow	5.0 gpm (19 liter/min)		60 Hz
Pressure	Cooling System Pressure	10	psi
Pressure	Cooling system pressure (pressure cap)	10	psi
Pressure	Fuel Injection Pressure	1991 psi (13.73 MPa)
Pressure	Fuel injection pressure	1991	psi (13.73 MPa)
Pressure	Maximum Exhaust Back Pressure	3	inch Hg (76 mm Hg)
Pressure	Maximum Exhaust Back Pressure	3 INCH (76 MM) HG
Pressure	Minimum engine oil pressure (shutdown/service threshold)	14	psi (98 kPa)
Resistance	Battery charging winding B1-B2	0.114	ohms	@ 77 F (25 C) +/-10%
Resistance	Coolant temperature sender E2	approximately 800	ohms	room temperature
Resistance	Field winding F1-F2	32	ohms	@ 77 F (25 C) +/-10%
Resistance	Governor actuator stator	1.7-2.8	ohms
Resistance	Oil pressure sender E1	227-257	ohms	0 psi, engine stopped
Resistance	Quadrature winding Q1-Q2	2.93	ohms	@ 77 F (25 C) +/-10%
Resistance	Rotor/stator winding insulation to ground	minimum 1	megohm
Resistance	Stator main winding T1-T2, T3-T4	0.353	ohms	@ 77 F (25 C) +/-10%
Speed	Engine/Generator Speed	2400/3000	rpm	50 Hz
Speed	Engine/Generator Speed	2900/3600	rpm	60 Hz
Speed	Engine/generator speed (50 Hz)	2400/3000	rpm	50 Hz
Speed	Engine/generator speed (60 Hz)	2900/3600	rpm	60 Hz
Speed	High-idle speed	3300-3400	rpm
Speed	Maximum cranking duration	20-60	seconds	engine temperature dependent
Speed	Preheat duration prior to cranking	max 15	seconds	engine temperature dependent
Speed	Rated RPM (50 Hz)	2400	rpm
Speed	Rated RPM (60 Hz)	2900	rpm
Speed	Starter disconnect speed	800	rpm
Temperature	Engine room temperature (best performance)	40	°C (104 °F)	maximum recommended
Temperature	Generator set air inlet temperature	50	°C (122 °F)	should not exceed under full load
Torque	Drive coupling nuts	8	lb-ft (12 N-m)
Torque	Engine-generator adapter mounting bolts (6)	21	lb-ft (29 N-m)
Torque	Exhaust manifold nuts (4) and mixer bolts (3)	8	lb-ft (11 N-m)
Torque	Fan hub bolt	45	lb-ft (61 N-m)
Torque	Flywheel mounting bolts (5)	42	lb-ft (56 N-m)
Torque	Front engine support bracket bolts (3)	41	lb-ft (55 N-m)
Torque	Generator end bell support bracket bolts	8	lb-ft (11 N-m)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Capacity	Notes
Coolant	Fleetguard ES Compleat and EG Premix (ethylene glycol based)
Coolant	50/50 mixture of water and ethylene glycol		above -37°C	2.1 liter	Use best quality ethylene glycol antifreeze with rust inhibitors and coolant stabilizers; distilled water best. Protection down to -34°F (-37°C).
Coolant	Ethylene glycol antifreeze, fully formulated with rust inhibitors and coolant stabilizers; 50/50 mixture of water and ethylene glycol		above -37°C	2.1 liter	Protection from freezing down to -34°F (-37°C); use fresh water low in minerals, distilled best
Engine oil	API Service Category CI-4 or better; SAE 15W-40 recommended	API CI-4		2.1 liter	2.2 quart (2.1 liter). Multigrade oils such as SAE 15W-40 are recommended for year-round use.
Engine oil	Premium Blue E 15W40			2.1 L (2.2 qt)	Lubricant oil - Premium Blue E 15W40
Engine oil	SAE 15W-40 (multigrade) recommended for year-round use	API Service Category CI-4 or better		2.1 liter	Choose viscosity grade appropriate for ambient temperatures expected until next scheduled oil change
Engine oil	SAE 15W-40 multi-grade recommended for year-round use	API Service Category CI-4 or better		2.1 liter	Choose viscosity grade appropriate for ambient temperatures expected until the next scheduled oil change (Figure 3-1)
Fuel	Gas Oil (red diesel, fuel oil, type A1 or A2)	USCG TYPE A1 or ISO 7840-A1 fuel hoses
Fuel	Grade 2-D diesel fuel (Grade 1-D if tank exposed below 40 F (5 C))	EN 590 or ASTM D975; Cetane number not less than 45; sulfur content not more than 0.5 percent by weight			Fuel lubricity: minimum load level 3100 grams per ASTM D6078 or maximum scar diameter 0.45 mm per ASTM D6079 or ISO 12156-1
Fuel	Grade 2-D diesel fuel; Grade 1-D if fuel tank exposed to temperatures below 40°F (5°C)	EN 590 or ASTM D975			Cetane number not less than 45; sulfur content not more than 0.5 percent by weight. Cloud point at least 10°F (6°C) below lowest expected fuel temperature. Fuel lubricity: minimum load level 3100 grams per ASTM D6078 or max scar diameter 0.45 mm per ASTM D6079 or ISO 12156-1.
Fuel	High quality Grade 2-D diesel fuel; use Grade 1-D if fuel tank exposed to temperatures below 40°F (5°C)	EN 590 or ASTM D975			Cetane number not less than 45; sulfur content not more than 0.5 percent by weight; fuel lubricity min 3100 grams per ASTM D6078 or max scar diameter 0.45 mm per ASTM D6079/ISO 12156-1

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Fault codes

Code	Name	Meaning	Severity	Action
1	High Engine Temperature	Engine coolant temperature exceeded design limit	Shutdown	Open sea valve; clean sea water strainer; check coolant level and repair leaks; check/replace raw water hoses; readjust a loose pump belt (p. 4-9); replace worn raw water impeller (p. 4-10); clean heat exchanger (p. 4-12); check through-hull; drain/clean cooling system (p. 4-6); replace coolant thermostat (p. 4-8); tighten coolant sender E2 ring terminal; test/replace sender E2; check continuity Pin 9 to E2
2	Low Oil Pressure	Low oil pressure	Shutdown	Check oil level; tighten sender E1 ring terminal; check sender E1 resistance and replace if necessary; check continuity Pin 10 to E1; replace sender with a gauge and service the engine lubrication system if oil pressure is less than 14 psi (98 kPa)
3	Service Check	A fault with a 2-Digit Fault Code Number occurred	Shutdown	Push and Release Stop to check the 2-Digit fault code (does not apply to e-Series Digital Display)
4	Overcrank	Cranking time exceeded 20 to 60 seconds, depending on ambient temperature	Shutdown	Push line circuit breaker OFF; check fuel tank and fill; remove combustion air or exhaust blockages; open closed fuel valves; prime the fuel system at least 30 seconds; service the battery; check all fuel filters and fittings and reprime; replace fuel filters; change to proper oil viscosity; conduct fuel pump test; inspect glow plugs; service fuel injectors and worn engine
5	Shutdown Due to Vessel CO	Dangerous levels of Carbon Monoxide in Vessel	Shutdown	Get everyone out into fresh air immediately and seek medical attention
7	Loss of Raw Water Flow	Insufficient raw water flow through the heat exchanger to cool the engine	Shutdown	Open sea valve; clean sea water strainer; check/replace raw water hoses; readjust a loose pump belt; replace worn raw water impeller; check through-hull; check continuity Pin 8 to B- and raw water flow switch S6
12	High AC Voltage	After voltage regulation was enabled, output voltage jumped to more than 125% of rated for 75 milliseconds or more than 115% of rated for 3 seconds	Shutdown	Push line circuit breaker OFF and start the genset; check all fuel filters and fittings for fuel and air leaks; check brushes and slip rings and rotor and stator windings; replace the genset controller
13	Low AC Voltage	After voltage regulation was enabled, output voltage fell to less than 90% of rated for 5 seconds	Shutdown	Reduce electrical loads; check fuel tank; remove air/exhaust blockages; prime fuel system; check fuel filters and fittings; replace fuel filters; check brushes/slip rings and windings; conduct fuel pump test; check governor actuator; readjust high idle speed; service injectors; check injection timing; check internal governor; service worn engine; replace controller
14	High AC Frequency	After the starter was engaged, frequency jumped to more than 70 Hz for 40 milliseconds or to more than 2% over nominal for 6 seconds	Shutdown	Check for a tripped genset circuit breaker and run with fewer loads; check fuel filters and fittings for air leaks and reprime; check governor actuator operation; check internal governor mechanism; replace the genset controller
15	Low AC Frequency	During normal operation, frequency fell to less than 90% of nominal for more than 8 seconds	Shutdown	Reduce loads with high motor starting loads; check fuel tank; remove air/exhaust blockages; prime fuel system; check fuel filters and reprime; replace fuel filters; conduct fuel pump test; check governor actuator; readjust high idle speed; service injectors; check injection timing; check internal governor; service worn engine; replace controller
17	Overprime
22	Governor Overload	Maximum allowable time at full-duty cycle was exceeded	Shutdown	Reduce appliances running at the same time; check fuel tank; remove air/exhaust blockages; prime fuel system; check fuel filters and reprime; replace fuel filters; conduct fuel pump test; check governor actuator; readjust high idle speed; service injectors; check injection timing; check internal governor; service worn engine; replace controller
23	Faulty Oil Pressure Sender	Controller sensed grounded sender	Shutdown	Tighten the ring terminal on sender E1; check continuity between Pin 10 and ring terminal E1-1; test sender E1 and replace as necessary; replace the genset controller
24	Faulty Temperature Sender	Controller sensed open sender	Shutdown	Tighten the ring terminal on sender E2; check continuity between Pin 9 and ring terminal E2-1; test sender E2 and replace as necessary; replace the genset controller
27	Loss of AC Voltage Sense	Controller lost VAC sensing during normal voltage regulation when the field was functioning normally and frequency was at least 40 Hz	Shutdown	Check continuity between Pin 11 (S1) and Pin 12 (S2); service or replace brush block, slip rings, rotor or stator; replace the genset controller
29	High Battery Voltage	During startup the controller sensed that battery system voltage was greater than 19.2 volts	Shutdown	Check battery bank connections and reconnect for 12 volts; select a lower battery booster charge rate
32	Starting Fault	The genset Controller could not detect cranking speed (quadrature zero crossings) for 3 seconds	Shutdown	Have the propulsion engines running while trying to start the genset; service the battery; change to oil of proper viscosity for the ambient temperature.
35	Control Card Failure-EE	During startup the controller detected a EE memory error	Shutdown	Replace the genset controller
36	Unknown Shutdown	Engine speed fell below 1000 RPM for 0.5 seconds, though not by genset or engine control action	Shutdown	Check for mechanical damage; reduce appliances running; check fuel level; remove air/exhaust blockages; prime fuel system; check fuel filters and reprime; replace fuel filters; conduct fuel pump test; check governor actuator; service brushes/slip rings and test rotor and quadrature windings; service injectors; check internal governor; service worn engine; replace controller
37	Invalid Genset Configuration	The controller is not configured properly for the genset	Shutdown	Make sure CONFIG 1 and CONFIG 2 leads are not connected and are terminated with insulated connectors; reconfigure the genset controller (p. 2-7); replace the genset controller
38	Field Overload	High field voltage induced by high rotor temperature or low power factor loads	Shutdown	Remove blockages to generator air flow; reduce appliances running; have air conditioners checked; check for a loose generator fan; service brushes and slip rings and test the field, stator and quadrature windings; replace a stator or rotor with faulty windings
41	Generator Rotor Fault	F+ grounded	Shutdown	Check for continuity between Pin P3-7 (F+) and B- (ground); repair or replace wiring, brushes and slip rings or rotor; replace the genset controller
42	Control Card ROM
43	Control Card Failure-RAM	During startup the controller detected a RAM memory error	Shutdown	Replace the genset controller
45	Speed Sense Lost	After start disconnect the controller lost speed sense (quadrature zero crossings) for 0.25 seconds	Shutdown	Check for open or shorted field (P3-6/P3-7) or quadrature (P3-4/P3-5) windings; service or replace brush block, slip rings, rotor or stator; replace the genset controller
46	Genset Overload	The genset Controller shutdown the genset because engine load exceeded 135 percent of genset rating for 10 seconds	Shutdown	Reduce the number of loads on the genset.
48	Field Sense Lost-RAM	Controller unable to sense field voltage	Shutdown	Replace the genset controller
57	Overprime	A local or remote control switch was held in the Prime position for more than 5 minutes	Shutdown	Remove any object holding a control switch in the prime position; replace any control switch S4 that does not open across terminals 1 and 2 when Stop is released
58	High Exhaust Temperature	Exhaust temperature exceeded design limits due to lack of water delivered to the exhaust/water mixer	Shutdown	Open sea valve; clean sea water strainer; check/replace raw water hoses; inspect siphon break; readjust a loose pump belt; replace worn raw water impeller; clean heat exchanger; check continuity between Pin P1-11 and B- and exhaust temperature switch S5
59	Low coolant level	Provides continuous monitoring of the coolant level in the engine block. If the level falls below a pre-set level for more than 10 seconds the genset control activates a shutdown and indicates fault code 59.	Shutdown	Repair any leak and add coolant as appropriate.
61	External Shutdown	Genset was shut down by a fire suppression system or other external control	Shutdown	Make all necessary repairs to the genset and connected equipment and reset the external control which shut down the genset
Code No. 5	Warning - Shutdown due to Vessel CO	Shutdown occurring due to the vessel CO detector	Warning	All status indicator lights in the control circuit will also blink the fault code. See Troubleshooting Chapter of the Operator Manual.
Code No. 61	Emergency Shutdown	Shutdown occurring due to external emergency shutdown device	Shutdown	All status indicator lights in the control circuit will also blink the fault code. See Troubleshooting Chapter of the Operator Manual.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Adjusting High-Idle Speed adjustment

⚠ Keep your hands away from the engine belt and pulleys.

⚠ The actuator could overheat if the battery is left on more than 10 minutes.

⚠ Be prepared to clamp off supply and return fuel lines to stop the engine.

Tools: strobe or injector clamp-on tachometer, 12 volt battery, battery switch

Adjust the speed control lever stop.
Measure engine speed with a strobe or injector clamp-on type tachometer.
Remove the front and top access doors and loosen the front/left side panel assembly for access to the speed adjusting screw.
Disconnect the actuator leads and connect a 12 volt battery to the actuator terminals using a battery switch.
Switch the battery on, start the genset, measure engine speed (rpm) and stop the engine by switching off the battery.
Loosen the lock nuts on the two bottom screws and back out the clamping screw if speed is not between 3300 and 3400 rpm.
To increase speed turn the speed adjusting screw in 1 turn clockwise; to decrease turn it out 1 turn counterclockwise.
Repeat until high-idle speed is between 3300 and 3400 rpm and set the lock nut.
Run the clamping screw in by hand until snug, back it out 1-1/2 turns and set the lock nut.

Adjusting Speed Control Lever Stop adjustment

⚠ Accidental or remote starting can cause severe personal injury; disconnect the negative battery cable.

Remove the front and top access doors and loosen the front/left side panel assembly so it can swing left.
Loosen the stop screw locknut and back the screw out a few turns.
Turn the stop screw in until it just makes contact and set the locknut.

Adjusting V-Belt Tension adjustment

⚠ Disconnect the negative battery cable to prevent accidental starting.

Tools: open-end wrench, 3/8 inch drive socket

Disconnect the negative battery cable to prevent the engine from starting.
Remove the front and top access doors; remove the end panel if work space is limited.
Loosen both bolts so that the pump can pivot.
Pivot the pump out to tighten belt tension and hold by tightening the tension adjusting bolt.
Check tension by applying 20 pounds (10 kg) to the middle of the pulley span; deflection should be 0.4 inch (10 mm).
Tighten the bolts, reassemble the panels and doors and reconnect the battery cables (negative last).

Adjusting Valve Lash adjustment

⚠ Do not use the fuel injection timing marks when adjusting valve lash.

Rotate the engine clockwise (looking from the front) until the intake valve push rod just stops moving down (valve closed).
Turn the engine one half turn more.
Adjust lash for both intake and exhaust valves of that cylinder.
Repeat this procedure for the other cylinder.

Adjusting Voltage Using Control Switch adjustment

Tools: separate voltmeter

Start the genset and let voltage and frequency stabilize for 5 to 10 seconds with all loads disconnected.
Rapidly press START 6 times during the first minute after startup to enter voltage adjust mode.
To adjust voltage up, press and quickly release START (about 0.6 volts per press).
To adjust voltage down, press and hold START for about 2 seconds (about 0.6 volts each press).
Wait about 20 seconds for the amber lamp to stop blinking, then press STOP to save the adjustment.
Restart the genset and check voltage.

Adjusting Voltage Using Digital Display adjustment

Start generator set and let voltage and frequency stabilize 5 to 10 seconds; disconnect all loads.
Rapidly press START 6 times during the first minute after startup to enter voltage adjust mode.
Press and quickly release START to increase voltage approximately 0.6 volts per press.
Press and hold START about 1 second to adjust voltage down.
Wait about 20 seconds for status to change from Volt Adj to Running, then press STOP to save.
Restart the generator set and check voltage; recalibrate AC voltage on the digital display.

Adjusting Voltage Using Optional Digital Display adjustment

Tools: Separate voltmeter

Start the genset and let voltage and frequency stabilize for 5 to 10 seconds; make sure all loads have been disconnected.
Rapidly press START 6 times during the first minute after startup to put the genset controller into voltage adjust mode.
To adjust voltage up, press and quickly release START; voltage increases approximately 0.6 volts each press and release.
To adjust voltage down, press and hold START for about 1 second; voltage decreases approximately 0.6 volts each press and release.
Wait about 20 seconds for the Display to indicate a Status change from Volt Adj to Running, then press STOP to stop the genset and save the adjustment.
Restart the genset and check voltage.
Recalibrate AC Voltage on the Digital Display as instructed in the Operator's Manual.

Changing Frequency adjustment

Connect J5 to P6 for 60 HZ.
Disconnect J5 from P7 for 50 HZ.
Apply the appropriate reconfiguration label.

Changing Generator Set Frequency adjustment

⚠ When changing frequency, make sure the line circuit breakers are suitable for the new output.

Remove the control box cover.
Connect J5 to P6 for 60 Hz.
Disconnect J5 from P7 for 50 Hz.
Apply the appropriate reconfiguration label.
Replace the control box cover.
Check and adjust voltage as necessary after the frequency has been changed.

Configuring the Controller Using Control Switch adjustment

⚠ In configuration mode the control will not start, prime or display faults.

Remove the insulating connectors from harness connectors CONFIG 1 and CONFIG 2 and connect them together.
Press START to increase the code number or STOP to decrease it one unit each press.
Set the configuration code number to 19 for this genset.
Verify the status lamp blinks one blink, pause, then nine blinks.
Disconnect CONFIG 1 from CONFIG 2 and re-install the insulating connectors.

Disabling Battery Charger adjustment

Disconnect the leads marked B1, B2 and B+ from the quick-connect terminals on battery charging voltage regulator.
Insulate the end of each lead with several wraps of listed electrical insulating tape and tie them neatly into the wiring harness.
Secure the access cover when done.

Valves - Adjust adjustment

Disconnect and connect battery cables, engine wiring harness, fuel lines, exhaust hose, coolant hoses
Drain and refill engine fluids
Remove and install soundshield, glowplugs, valve cover
Adjust valve lash
Test run unit

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

Voltage	Phase	Connection	Leads	Notes
		50 Hz: Disconnect J5 from P7	J5, P6, P7	Frequency selection jumper leads in the genset control box
		60 Hz: Connect J5 to P6	J5, P6, P7	Frequency selection jumper leads in the genset control box
220/208	3	12 Lead Reconnectable		Applies to MDKDP (60 Hz), MDKDR (60 Hz), MDKDS
220/380	3	12 Lead Reconnectable		Applies to MDKDP, MDKDR, MDKDT, MDKDU
3-phase	3	12 Lead Reconnectable		Applies to MDDCW, MDDCU, MDDCY, MDDCS, MDDCT

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

Which oil filter part number does the Cummins/Onan MDKBH take?

The Cummins/Onan MDKBH uses oil filter part number 185-7444.

Which fuel filter part number does the Cummins/Onan MDKBH take?

The Cummins/Onan MDKBH uses fuel filter part number 149-2106.

Troubleshooting

Fault codes

Code	Meaning	Remedy
1	High engine temperature — Engine coolant temperature exceed design limit	Open the sea valve; Check for and clean a blocked sea water strainer. If above the water line, fill the strainer with water to assist priming; Check engine coolant level, add coolant as necessary and check for and repair leaks (p. 4-7); Check for and reconnect or replace any disconnected, kinked or leaking raw water hoses; Check the bottom of the hull for any blockage at the through-hull fitting; Drain and clean the cooling system to remove fouling (p. 4-7); Replace the coolant thermostat, which might not be opening fully (p. 4-10)
2	Low oil pressure — Low oil pressure	Check engine oil level, add or drain oil as necessary and repair any leaks (p. 4-4)
3	Service check — A fault with a 2-Digit Fault Code Number occurred	Check the 2-Digit fault code by Pushing and Releasing Stop. The 2-Digit fault will be one of the following in this table. (Does not apply to e-Series Digital Display.)
4	Overcrank — Cranking time exceeded 20 to 60 seconds, depending on ambient temperature	Push the generator set line circuit breaker OFF; Check the fuel tank and fill as necessary. (Note: The arrangement of pickup tubes in the fuel supply tank probably is such that the generator set will run out of fuel before the propulsion engines.); Remove combustion air or exhaust system blockages; Open any closed fuel supply and return valves; Prime the engine fuel system for at least 30 seconds (p. 3-3); Service the battery as necessary by cleaning and tightening connections, recharging or replacing the battery or replacing damaged battery cables (p. 4-3); Check all fuel filters and fittings for fuel and air leaks, tighten as necessary and reprime; Replace the fuel filters and reprime (p. 4-6); Change the engine oil to oil of the proper viscosity for the ambient temperature. High oil viscosity can slow down cranking speed
7	Loss of raw water flow — Insufficient raw water flow through the heat exchanger to cool the engine	Open the sea valve; Check for and clean a blocked sea water strainer. If above the water line, fill the strainer with water to assist priming; Check for and reconnect or replace any disconnected, kinked or leaking raw water hoses; Check the bottom of the hull for any blockage at the through-hull fitting
12	High AC voltage — After voltage regulation was enabled Output Voltage jumped to more than 125percent of rated for 75 milliseconds or to more than 115percent of rated for 3 seconds	Push the generator set line circuit breaker OFF, start the generator set. If output voltage is normal, the problem is in the circuits external to the generator set; Check all fuel filters and fittings for fuel and air leaks, tighten as necessary and reprime. (Air bubbles can disrupt frequency.)
13	Low AC voltage — After voltage regulation was enabled Output Voltage fell to less than 90percent of rated for 5 seconds	Push the generator set line circuit breaker OFF. If the generator set now runs and voltage and frequency are normal, reduce the number of electrical loads; Check the fuel tank and fill as necessary. (Note: The arrangement of pickup tubes in the fuel supply tank probably is such that the generator set will run out of fuel before the propulsion engines.); Remove combustion air or exhaust system blockages; Prime the engine fuel system for at least 30 seconds (p. 3-3); Check all fuel filters and fittings for fuel and air leaks, tighten as necessary and reprime. (Air bubbles can disrupt frequency.); Replace the fuel filters and reprime (p. 4-6)
14	High AC frequency — After the starter was engaged Frequency jumped to more than 70 Hz for 40 milliseconds or to more than 2percent over nominal for 6 seconds	Check for a tripped generator set circuit breaker, reset it if necessary, and run with fewer connected loads. (A breaker tripping under load can cause generator set frequency to overshoot.); Check all fuel filters and fittings for fuel and air leaks, tighten as necessary and reprime. (Air bubbles can disrupt frequency.)
15	Low AC frequency — During normal operation Frequency fell to less than 90percent of nominal for more than 8 seconds	Push the generator set line circuit breaker OFF. If the generator set now runs, reduce the number of loads, especially those with high motor starting loads such as air conditioners; Check the fuel tank and fill as necessary. (Note: The arrangement of pickup tubes in the fuel supply tank probably is such that the generator set will run out of fuel before the propulsion engines.); Remove combustion air or exhaust system blockages; Prime the engine fuel system for at least 30 seconds (p. 3-3); Check all fuel filters and fittings for fuel and air leaks, tighten as necessary and reprime. (Air bubbles can disrupt frequency.); Replace the fuel filters and reprime (p. 4-6)
22	Governor overload — Maximum allowable time at full-duty cycle was exceeded	Reduce the number of appliances running at the same time, especially those with high motor starting loads such as air conditioners; Check the fuel tank and fill as necessary. (Note: The arrangement of pickup tubes in the fuel supply tank probably is such that the generator set will run out of fuel before the propulsion engines.); Remove combustion air or exhaust system blockages; Prime the engine fuel system for at least 30 seconds (p. 3-3); Check all fuel filters and fittings for fuel and air leaks, tighten as necessary and reprime; Replace the fuel filters and reprime (p. 4-6)
23	Faulty oil pressure sender — Controller sensed grounded sender	See an authorized Onan service representative
24	Faulty temperature sender — Controller sensed open sender	See an authorized Onan service representative
27	Loss of AC voltage sense — The generator set Controller lost VAC sensing during normal voltage regulation when the field was functioning normally and frequency was at least 40 Hz	See an authorized Onan service representative
29	High battery voltage — During startup the generator set Controller sensed that battery system voltage was greater than 19.2 volts	Check battery bank connections and reconnect if necessary for 12 volts; Select a lower battery booster charge rate
35	Control card failure−EE — During startup the generator set Controller detected a EE memory error	See an authorized Onan service representative
36	Unknown shutdown — The generator set Controller declared this fault because engine speed fell below 1000 RPM for 0.5 seconds, though not by generator set or engine control action	Check for mechanical damage and service as necessary; Reduce the number of appliances running at the same time, especially those with high motor starting loads such as air conditioners; Check fuel level and refill as necessary. (Note: The generator set fuel pickups are probably higher than the propulsion engine fuel pickups.); Remove combustion air or exhaust system blockages; Prime the engine fuel system for at least 30 seconds (p. 3-3); Check all fuel filters and fittings for fuel and air leaks, tighten as necessary and reprime; Replace the fuel filters and reprime (p. 4-6)
37	Invalid genset configuration — The generator set Controller is not configured properly for the generator set	See an authorized Onan service representative
38	Field overload — High field voltage induced by high rotor temperature or low power factor loads	Remove blockages to generator air flow at the front inlet grill and right side, if enclosed; Reduce the number of appliances running at the same time, especially those with high motor starting loads such as air conditioners; Have air conditioners and other appliances checked for proper operation. (A locked compressor rotor can cause very low power factor.)
41	Generator rotor fault — F+ grounded	See an authorized Onan service representative
43	Control card failure−RAM — During startup the generator set Controller detected a RAM memory error	See an authorized Onan service representative
45	Speed sense lost — After start disconnect the generator set Controller lost speed sense [quadrature zero crossings] for 0.25 seconds	See an authorized Onan service representative
48	Field sense lost−RAM — Controller unable to sense field voltage	See an authorized Onan service representative
57	Overprime — A local or remote control switch was held in the Prime position for more than 5 minutes	Check for and remove any object that may be holding either control switch (remote or local) in the prime position
58	High exhaust temperature — Exhaust temperature exceeded design limits due to lack of water delivered to the exhaust/water mixer	Open the sea valve; Check for and clean a blocked sea water strainer. If above the water line, fill the strainer with water to assist priming; Check for and reconnect or replace any disconnected, kinked or leaking raw water hoses; Inspect the siphon break (if provided) for proper operation
61	External shutdown — The generator set was shut down by a fire suppression system or other external control	Make all necessary repairs to the generator set and connected equipment and reset the external control which shut down the generator set

Symptoms & remedies

Symptom	Cause	Remedy
No response at operator panel or control switch	Faulty switch, poor or missing connections, dead battery	Push the Emergency Stop Breaker ON if tripped; Try the Operator Panel or control switch on the generator set (local) if there is no response at a remote Operator Panel or control switch, and vice versa; If none of the Operator Panels or control switches works, service as necessary by cleaning and tightening battery connections, recharging or replacing the battery or replacing damaged battery cables (p. 4-3)
The starter engages and disengages	Low cranking voltage	Push the generator set line circuit breaker OFF; Service the battery as necessary by cleaning and tightening connections, recharging or replacing the battery or replacing damaged battery cables (p. 4-3)
The starting batteries do not maintain a charge	Marginal battery, battery connections or charging system	Service the battery as necessary by cleaning and tightening connections, recharging or replacing the battery or replacing damaged battery cables (p. 4-3); Check for and disconnect parasitic battery loads
No AC power when generator set is running	A Circuit Breaker is OFF, tripped or malfunctioning or the generator is not connected properly	Reset or turn ON the generator set circuit breaker if OFF or tripped; Reset or turn ON any other circuit breaker in the AC power supply system if OFF or tripped

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.

Repair guides

Step-by-step procedures compiled from the Cummins/Onan service manual for this model.

Parts

Part #	Description	Qty	System
0541-0876-02	Siphon break assembly, eight hose clamps, two rubber grommets, two pre-formed rubber hoses, two 3/4 in hose unions and instruction sheet		Siphon break	Amazon eBay $229.91
149-2106	Element	1	Fuel filter	Amazon eBay $34.99 NAPA $61.61 KuduParts $68.00
185-5421	Plug, Glow	2	Glow plug	Amazon eBay $35.00
185-7444	Filter, Oil	1	Oil filter	Amazon eBay $29.95 NAPA $9.09 KuduParts $11.00 FridayParts $13.23
511-0197	V-Belt	1	Belt	Amazon eBay
541-1524	Pump Impeller		Impeller	eBay $122.63
1000-1500	Electric Frying Pan or Wok	1200	Service part / kit	Amazon eBay
1400-2000	Air Conditioner		Service part / kit	Amazon eBay
200-500	Electric Blanket		Service part / kit	Amazon eBay
200-600	Radio	1	Service part / kit	Amazon eBay
250-750	Electric Broom		Service part / kit	Amazon eBay
300-700	Refrigerator		Service part / kit	Amazon eBay
350-1000	Electric Stove Element Power Consumption (watts)		Service part / kit	Amazon eBay
50-200	Electric Blanket Power Consumption (watts)	1	Service part / kit	Amazon eBay
500-1200	Electric Hair Dryer		Service part / kit	Amazon eBay
524-0118	Molybdenum disulfide paste		Service part / kit	eBay
550-750	Coffee Percolator Power Consumption (watts)		Service part / kit	Amazon eBay
600-1000	Refrigerator	1	Service part / kit	Amazon eBay
800-1500	Coffee Percolator		Service part / kit	Amazon eBay
981-0176	Redistribution or publication of this document, by any means, is strictly prohibited. California		Service part / kit	Amazon eBay

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Available documents

Operator's manual — 981-0176 ONAN MDKBH Marine Genset Operator's manual (06-2005) (Cummins/Onan)Operator's manual — Manual Operador Marino QD 6kWz (Cummins/Onan)Reference — 0059599 (Cummins/Onan)Parts manual — 0043090 (Cummins/Onan)Parts manual — F-1379-EN (Cummins/Onan)Service manual — 900-0620B Onan MDKAU MDKBH Repair Times (Onan Corporation (Cummins Power Generation))Service manual — 981-0542 Onan MDKBH Service Manual (11-2005) (Cummins/Onan)Service manual — 981-0643 Onan MDKBH Installation Manual (6-2005) (Cummins/Onan)Service manual — 981-0647 Onan MDKBH Spec A-E Installation Manual (10-2013) (Cummins/Onan)

This page was generated from the 9 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

Cummins/Onan MDKBH Generator Set

Service parts for the MDKBH

Fuel system

Oil system

Belts

Specifications

Maintenance & consumables

Service intervals

Service specifications

Recommended fluids

Fault codes

Procedures

Voltage reconnection

Common questions

Troubleshooting

Fault codes

Symptoms & remedies

Repair guides

Parts

Available documents